qemu/hw/adlib.c

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/*
* QEMU Adlib emulation
*
* Copyright (c) 2004 Vassili Karpov (malc)
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "vl.h"
#define dolog(...) AUD_log ("adlib", __VA_ARGS__)
#ifdef DEBUG
#define ldebug(...) dolog (__VA_ARGS__)
#else
#define ldebug(...)
#endif
#ifdef USE_YMF262
#define HAS_YMF262 1
#include "ymf262.h"
void YMF262UpdateOneQEMU(int which, INT16 *dst, int length);
#define SHIFT 2
#else
#include "fmopl.h"
#define SHIFT 1
#endif
#ifdef _WIN32
#include <windows.h>
#define small_delay() Sleep (1)
#else
#define small_delay() usleep (1)
#endif
#define IO_READ_PROTO(name) \
uint32_t name (void *opaque, uint32_t nport)
#define IO_WRITE_PROTO(name) \
void name (void *opaque, uint32_t nport, uint32_t val)
static struct {
int port;
int freq;
} conf = {0x220, 44100};
typedef struct {
int enabled;
int active;
int cparam;
int64_t ticks;
int bufpos;
int16_t *mixbuf;
double interval;
QEMUTimer *ts, *opl_ts;
SWVoice *voice;
int left, pos, samples, bytes_per_second, old_free;
int refcount;
#ifndef USE_YMF262
FM_OPL *opl;
#endif
} AdlibState;
static AdlibState adlib;
static IO_WRITE_PROTO(adlib_write)
{
AdlibState *s = opaque;
int a = nport & 3;
int status;
s->ticks = qemu_get_clock (vm_clock);
s->active = 1;
AUD_enable (s->voice, 1);
#ifdef USE_YMF262
status = YMF262Write (0, a, val);
#else
status = OPLWrite (s->opl, a, val);
#endif
}
static IO_READ_PROTO(adlib_read)
{
AdlibState *s = opaque;
uint8_t data;
int a = nport & 3;
#ifdef USE_YMF262
(void) s;
data = YMF262Read (0, a);
#else
data = OPLRead (s->opl, a);
#endif
return data;
}
static void OPL_timer (void *opaque)
{
AdlibState *s = opaque;
#ifdef USE_YMF262
YMF262TimerOver (s->cparam >> 1, s->cparam & 1);
#else
OPLTimerOver (s->opl, s->cparam);
#endif
qemu_mod_timer (s->opl_ts, qemu_get_clock (vm_clock) + s->interval);
}
static void YMF262TimerHandler (int c, double interval_Sec)
{
AdlibState *s = &adlib;
if (interval_Sec == 0.0) {
qemu_del_timer (s->opl_ts);
return;
}
s->cparam = c;
s->interval = ticks_per_sec * interval_Sec;
qemu_mod_timer (s->opl_ts, qemu_get_clock (vm_clock) + s->interval);
small_delay ();
}
static int write_audio (AdlibState *s, int samples)
{
int net = 0;
int ss = samples;
while (samples) {
int nbytes = samples << SHIFT;
int wbytes = AUD_write (s->voice,
s->mixbuf + (s->pos << (SHIFT - 1)),
nbytes);
int wsampl = wbytes >> SHIFT;
samples -= wsampl;
s->pos = (s->pos + wsampl) % s->samples;
net += wsampl;
if (!wbytes)
break;
}
if (net > ss) {
dolog ("WARNING: net > ss\n");
}
return net;
}
static void timer (void *opaque)
{
AdlibState *s = opaque;
int elapsed, samples, net = 0;
if (s->refcount)
dolog ("refcount=%d\n", s->refcount);
s->refcount += 1;
if (!(s->active && s->enabled))
goto reset;
AUD_run ();
while (s->left) {
int written = write_audio (s, s->left);
net += written;
if (!written)
goto reset2;
s->left -= written;
}
s->pos = 0;
elapsed = AUD_calc_elapsed (s->voice);
if (!elapsed)
goto reset2;
/* elapsed = AUD_get_free (s->voice); */
samples = elapsed >> SHIFT;
if (!samples)
goto reset2;
samples = audio_MIN (samples, s->samples - s->pos);
if (s->left)
dolog ("left=%d samples=%d elapsed=%d free=%d\n",
s->left, samples, elapsed, AUD_get_free (s->voice));
if (!samples)
goto reset2;
#ifdef USE_YMF262
YMF262UpdateOneQEMU (0, s->mixbuf + s->pos * 2, samples);
#else
YM3812UpdateOne (s->opl, s->mixbuf + s->pos, samples);
#endif
while (samples) {
int written = write_audio (s, samples);
net += written;
if (!written)
break;
samples -= written;
}
if (!samples)
s->pos = 0;
s->left = samples;
reset2:
AUD_adjust (s->voice, net << SHIFT);
reset:
qemu_mod_timer (s->ts, qemu_get_clock (vm_clock) + ticks_per_sec / 1024);
s->refcount -= 1;
}
static void Adlib_fini (AdlibState *s)
{
#ifdef USE_YMF262
YMF262Shutdown ();
#else
if (s->opl) {
OPLDestroy (s->opl);
s->opl = NULL;
}
#endif
if (s->opl_ts)
qemu_free_timer (s->opl_ts);
if (s->ts)
qemu_free_timer (s->ts);
#define maybe_free(p) if (p) qemu_free (p)
maybe_free (s->mixbuf);
#undef maybe_free
s->active = 0;
s->enabled = 0;
}
void Adlib_init (void)
{
AdlibState *s = &adlib;
memset (s, 0, sizeof (*s));
#ifdef USE_YMF262
if (YMF262Init (1, 14318180, conf.freq)) {
dolog ("YMF262Init %d failed\n", conf.freq);
return;
}
else {
YMF262SetTimerHandler (0, YMF262TimerHandler, 0);
s->enabled = 1;
}
#else
s->opl = OPLCreate (OPL_TYPE_YM3812, 3579545, conf.freq);
if (!s->opl) {
dolog ("OPLCreate %d failed\n", conf.freq);
return;
}
else {
OPLSetTimerHandler (s->opl, YMF262TimerHandler, 0);
s->enabled = 1;
}
#endif
s->opl_ts = qemu_new_timer (vm_clock, OPL_timer, s);
if (!s->opl_ts) {
dolog ("Can not get timer for adlib emulation\n");
Adlib_fini (s);
return;
}
s->ts = qemu_new_timer (vm_clock, timer, s);
if (!s->opl_ts) {
dolog ("Can not get timer for adlib emulation\n");
Adlib_fini (s);
return;
}
s->voice = AUD_open (s->voice, "adlib", conf.freq, SHIFT, AUD_FMT_S16);
if (!s->voice) {
Adlib_fini (s);
return;
}
s->bytes_per_second = conf.freq << SHIFT;
s->samples = AUD_get_buffer_size (s->voice) >> SHIFT;
s->mixbuf = qemu_mallocz (s->samples << SHIFT);
if (!s->mixbuf) {
dolog ("not enough memory for adlib mixing buffer (%d)\n",
s->samples << SHIFT);
Adlib_fini (s);
return;
}
register_ioport_read (0x388, 4, 1, adlib_read, s);
register_ioport_write (0x388, 4, 1, adlib_write, s);
register_ioport_read (conf.port, 4, 1, adlib_read, s);
register_ioport_write (conf.port, 4, 1, adlib_write, s);
register_ioport_read (conf.port + 8, 2, 1, adlib_read, s);
register_ioport_write (conf.port + 8, 2, 1, adlib_write, s);
qemu_mod_timer (s->ts, qemu_get_clock (vm_clock) + 1);
}